<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>属性值的简单形式</title>
    <style type="text/css">
        #outerBox{
        width:200px;
        height:100px;
        border:2px black solid;
        border-left:4px green dashed;
        border-color:red gray orange blue;/*上 右 下 左 */
        border-right-color:purple;
        }
    </style>
</head>
<body>
   <div id="outerBox">
   </div>
</body>
</html>